fix: URI router preserving the URI path

[lidel]

Some improvements to the intermediate router page we use for URI support:

👉 Open "Test" links in incognito window, it will use public gateway as a fallback and give better feeling of how things behave when network is slow.

• hide error UI and display "Processing IPFS request.." while redirecting for a nicer UX (no error flashing red for a bling of an eye)
• preserve path, so URIs like below work:
  • Demo: https://bafkreiacamq42cltx3ussmxb2ey3mmpisthrs3kelwuxnwt7oofvqsjvgm.ipfs.dweb.link/#ipfs%3A%2F%2FQmXoypizjW3WknFiJnKLwHCnL72vedxjQkDDP1mXWo6uco%2Fwiki%2FDiego_Maradona.html
• add support for dnslink names in ipns namespace
  • This can ship before we land TLS for DNSLink websites loaded via public subdomain gateways in-web-browsers#169 – we will update our GW when go-ipfs 0.8.0 ships
  • Test: https://bafkreiacamq42cltx3ussmxb2ey3mmpisthrs3kelwuxnwt7oofvqsjvgm.ipfs.dweb.link/#ipns%3A%2F%2Fdocs.ipfs.io
• remove cids library – delegate all the conversion to path-router at the subdomain gateway
  • this removes the need for bumping library version when new encoding/codec is added, making this more future proof
  • we still check if URI starts with qm to display human-friendly help added in docs: improved "Cannot process IPFS request" page #911
  • Demo: https://bafkreiacamq42cltx3ussmxb2ey3mmpisthrs3kelwuxnwt7oofvqsjvgm.ipfs.dweb.link/#ipfs%3A%2F%2Fqmbwqxbekc3p8tqskc98xmwnzrzdtrlmimpl8wbutgsmnr%2Fwiki%2FDiego_Maradona.html

[lidel]

Merging as-is, so we can have more eyes on it in Beta channel.

@fred-wang FYSA we are still waiting for ipfs/kubo#7802 - until that lands there is an improved router at:

https://bafkreiacamq42cltx3ussmxb2ey3mmpisthrs3kelwuxnwt7oofvqsjvgm.ipfs.dweb.link/#%s

Demo: https://bafkreiacamq42cltx3ussmxb2ey3mmpisthrs3kelwuxnwt7oofvqsjvgm.ipfs.dweb.link/#ipfs%3A%2F%2FQmXoypizjW3WknFiJnKLwHCnL72vedxjQkDDP1mXWo6uco%2Fwiki%2FDiego_Maradona.html